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Hello, A 2.5 square feet shelf for vegetative stage (5-10 plants at most, in 1 gallon containers). A 5.5 square feet shelf for flowering (3-7 plants at most, in 3 gallon caontainers). The plants will be forced to flower at a height no more than 10 inches. So the expected plant height at the...

This may sound stupid but anyway :) Is it possible to understand a seed's or seedling's sex with for example dna analysis? Or the dominant genes for the sex determination become apparent only in flowering phase?

Well, these bagseed plants are in their second vegetative week (26 days from sprouting). They were germinated in plastic cups and 20 days ago transplanted to 1.5 gallon containers. Their height is around 4-8 inches and already some some root tips have appeared out of the drainage holes. Is it...

TodayIsAGreenday's experiment can be considered as a semi-scientific study in my opinion, which makes the method worth trying at least...

People generally keep their plants short for many reasons. Keeping the lights closer (up to 3-5 inches) helps to keep the plant height short. Forcing flowering early (after 3-4 weeks of vegetative growth) also helps. How old is this plant?

Well it was going strangely smooth until now but i guess the real challenge begins now... Today some plants were really droopy and were watered (pictures before and 6 hours after watering are attached). There are some minor? problems going on with the plants these days. They show some signs...

These plants are four weeks old. Although they've been treated in the same way, each developed different problems, no wonder... The room temperature is too high (80-84F). Humidity is around 50-55%. Four days ago i used a general purpose nutrient solution (7-6-6) with secondary and trace...

Two times more light is needed during in flowering stage than it's during vegetative stage. Also, orange-red spectrum of light is more efficient during flowering. So if you already haven't, add some warm white (2200-2500K) light into your setting. Plain white plastic is better than aluminum...

Well, three 600W HID setting (1 MH, 2 HPS) seems quite nice as far as i'm concerned ::bigjoint:

Where have you read that? Because as far as i read, HPS is better even for vegetative stage (HPS emit more amount of blue light than MH, although less in percentage).

When have you switched to 12/12 light cycle?

Thanks a lot widowman. I guess i spilt some water on them...

These plants are 25 days old from the sprouting and are in the first days of second vegetative week (according to my calculations). As you can see in the pictures the stems have purple lines. The upper part of the branches are also purple. They were transplanted 18 days ago and watered...

The nutrient solution used didn't have sulfur in it and according to "plant problems forum," purple stems and branches are because of sulfur deficiency. But these plants don't have the other symptoms of sulfur deficiency, so i guess we have a problem...

The temperature was never below 28C (82.5F). The plants seem to suffer a bit from the high temperature. The humidity was around 50-60% for the last several days. The ph of the soil is around 7-8. It's been only three days since the second watering and the soil is already dry on the first couple...

A couple of lower leaves of some other plants also developed the same problem. Is this "heat stress" because of a temporary change in the temperature or simply because of high temperature? I took them out of the grow room (28 centigrade) to another room (20 centigrade) for several hours, can...

I recently came across with an article which argues that HPSs--although less in percentage--emit more amount of blue light than MHs do. And since the luminous efficacy of HPSs too are far better than MHs, is there a reason to ever use MH bulbs? Thanks.

After adding the last CFLs, i think it's seems that using two 150W HPS and/or MH (one for vegetative, one for flowering) is a more logical lighting solution. There will be about 5-6 plants under each bulb. For flowering, a 250W HPS can be used or 150W HPS supported by warm white vertical CFLs...

This one has sprouted 20 days ago and seemed fine until i watered it one day before this picture was taken. There was some general purpose nutrient solution in the water (7-6-6 + secondary and trace elements). I guess i accidentally poured a little water on the leaves while watering, may this...

While measuring the plants' height, one of the lower leaves of a U1 plant was accidentally cut. Since the injured plant was one of the weakest ones and there's not much space in the room, i decided to take it out of the room and force it to flower. This little one has stayed in a dark room for...